Greg, I stand corrected.
Another product, maybe a lighting contactor, that I'd come across was listed for 2 conductors per terminal, with the same #14-#8 range.
It had a different torque value given for #8-10 than the #12-14
I got a 30A QO this morning with 30ft pounds given for the torque, no matter what the use (although it says that AL wire may not be used for the 2 wires per terminal application).